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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef5e33039aa1bffb3f2e43c00777b599f45fdb5455639f95f722e65dcf4d4ed7' 
  AND token = 'Tlm0gLtSjfeIYqNQDRC3W7P5pqKMrtdSMZ4qnb5QOzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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