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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd65ba8d15c088d29689e5a25b2b05b0e76fb9a7f746c1c18d888acaa1f4f4cf7' 
  AND token = 'jsZBnFTpt7WllJS5NpoULK/Uv+PlAHZf5ncV0IaohLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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