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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd59911201ea513c5cd859b562de34d6311d381c466c77002b0a27c2cfe64686a' 
  AND token = 'jyJDxc6m3XT62/np4t4ho8p0drvdmteo02AV6xm3sck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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