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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d3bbd5e71a434832f3b7853bcc8096f7de761dd4192db98f29dc07726c477d5' 
  AND token = 'p0/YesEW3HPR6phO/3TV+3Yh5wUv1UpwP9inyYdw9iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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