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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '676f12f9ade18abd3063ab0a6257b7bdaf323a079614faa1a33350f3e831b6cc' 
  AND token = 'YFfkZGlHcdmSUQ9Bwlx9q0Z5WJe4d71fPZ+UBDGxQ2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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