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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d66676e8659b27d3bc7e41d1b86b8304fc50b0c34e7313e50ad5d0632c8eac0' 
  AND token = '5/BX1azcrxRwZ39ZkWEv2ov8EOk4ObVHtLQFcYXFNFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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