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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa8d7a789ca50f190c4432b6a4a8cc16a03bd09a668760e1f2e2bc542349a51d' 
  AND token = 'llGZIAuxjMd7qarFBXIFHgtVNMq0n3i20fWqXY3t+Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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