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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4382d99c69bf6a6db6dd8b0d3af6d7d81d62f13e1371313c3ce9632c4fbc787e' 
  AND token = 'dyA3TfGsObTbaa23WfXnOxoat0YIxKSOvnXVLlTlmrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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