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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e08c20a21ca3c58096737a13ecab7fb291d086577e0e3a529283e4dcafef30f9' 
  AND token = '4eZLZgFcf3gTVUQFDbEWkjBNr+rk/DRDFcqybPy+dAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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