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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a3247d15e678fbe7055cd6443b6a47ab1ba0d07d3cb03925582f400510ce9b' 
  AND token = 'ThTuGi9uHnFea4Bz+8vWHWfc+ZXuK0mhaPWFpof8pG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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