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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c399e8f60392c68c1e11d4e94079c09efd27757b5ce2c484eb30f21a8528abf' 
  AND token = 'zRu9BV4Lc8NR/O8cQca7ibeCpdloYVaccwCN8FYoLyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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