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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '408aef104ef82dbf7653dab0975e5b7925f4a24b19e0cd68ee65d22f78e63174' 
  AND token = 'WapVbqI7JnCaFQ7iiq2QT9K9bHKrHvF/IROygxK2IJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

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