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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '565cfea5617a2f0d4caa88b2887c9d99bbe7a03c4382262decc1cf72ac2ac4f0' 
  AND token = 'eo9rUYGdFV6QlioMGinnQ+HPoMO4ewXoTldFq82ZnbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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