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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16eda43d95b45b748510f9ff9aa1829761c61cbc46fb4a40d3b3188bf2a8e922' 
  AND token = 'aLlzchvLJ5ivB8f5m4JrXmR/k2a7iNDQoaGohVOGdLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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