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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '406a8d85111af0c151f9b6fcdca0fd5f6124e0ca1fc849f15df33fd5b2110e59' 
  AND token = 'iZzmgEqqE7/px4LJJCSv4VCY2FMqjRmwiy4x9ePcHss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}