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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e7bf03983f335518f2db7c6c62aed5f2c2ff0aa07275abd5f7c70b62b1655ac' 
  AND token = '/RBOJb8JDhtfOlN5JPWISx/6GU1BBbDSdLGAQTT+CaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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