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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '594f5a52ac557ddc91de7a1e325c27f0cf9f161e70bd307f7e5cad2f2bb6dd25' 
  AND token = 'ULzLOlcEs67UidUuavu4ndjlHHZWopnqby5P8xXRCEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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