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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6807b5ad693e5b7469f73543ea11c925fa9ad33751a8cbc4701b408e20e373e5' 
  AND token = 'S/4zbb8goPa9TxEvdnri37jRrMDw0Xv7dbO3fwbzwWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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