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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3a38a664b78c0ee199807c78a167c029ce81e021eab71896763b76994ce5d2b' 
  AND token = '9YNPH6VavZ8t3zTnIcgEWTnhhgrk3hlPGTUg6Kue2lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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