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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a631890986daf9fa4c2e7d09da31bab8ba99ac2d6d51a143a95abc7be562a29' 
  AND token = 'HuxwYG3C3LkSs7EtGLKEIisw0J6Um+QunH8mA34H+MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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