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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dfd9c2611a01714adbb4e382c4b8c5bee9f5fd57a70a7f9f7ebe91fcb2d2ab6' 
  AND token = 'TrVY5oHfA8eV0W2JtGn2RoqQ3fzhSekAaCmkfqvtzEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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