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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e64977ba96c24f526e22990812d4ee2d78352f4de03d35e8487fe5371584ed6e' 
  AND token = 'iP9/M2aJO2HYH25nbCoIvmNOR7IecZtRySr2JDqMmwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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