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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd2051a6e7d6e3aa0691becfe4292df55822863351b60775174b0623dd94ef9b' 
  AND token = 'PFe/9OV6z03VaWSXwh2ki5BiJuhMmYF0oSlV5Pe1zfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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