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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b392ff418e94d9b32fdb16b3d3180eee9df76d87e0def2d1c5c30da18c9c34' 
  AND token = '4JupSdXL03WhOLJhsUApcju8eshTWEEWyDI9keGduY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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