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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ea89bde36255c203e37a867a0111685b93f8703fa134c2f874ec628178fd11b' 
  AND token = '7vUtnDzDdre2Ee4iZa+PWhKMcct1wAzThsjQaxOtjSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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