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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c10cbae927aeed008027f49e60514eec267a5360c35debad20c0abb275c671' 
  AND token = 'Wjm5vomL5GCE9xDrfsUeP6LfB6mvOuBuwm6J6kmwNx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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