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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e14a564d032f7839a5214b8dac8a41b0ee9c6553637c4482911f97b4a3bdbef' 
  AND token = '0/1W7St3wsr/wFInWp3SZbQ5t0U9Rcr/tTK/WfPEh38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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