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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5953331aff7b4a2cdb96b26494fb2f3045bda2d66687ee389e0a41ddeb580295' 
  AND token = 'brlgB7sadws88gAMh2XnVS68Nu0XilFVkgNBi+jtDGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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