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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0489f00c4e7eef80e691f0a937ca7dec6e430cf6698d72e17e5fd5f016e2ac87' 
  AND token = 'pzRrVZbN/RTE90GiV4RGk/NVVjbQjV5Ku6HEcmQjV9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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