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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36e08673c6f155f412d52435673257c67b0d06525e3b1225daa7cabf499ab90' 
  AND token = 'yPQwkG3ASzbwm5gJ4dSFYm7esTmXBguMLKkorwDFOWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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