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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93863860be9bc8d82eeccc9893bc3403b246daddd46a8c770981a389fec48d44' 
  AND token = 'K1SWQBI4ou7NuQiESzKSIV5Jfu5TSHs6umVke8SbjrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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