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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ddb6159b14388e034e1c4fd9bd6fb4f90f5465b0747404d486727c6b882abcb' 
  AND token = 'of6OQjxwB7raYG/w3J65Th9+9JjD6SfIrt7cnMMiC+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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