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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c63a6475f4713b7d82450c4e3e4420e7f2832111df7b23a207ff6fc749826095' 
  AND token = 'v/ZNcL+m6ijNdI6XStrECkTe1E9Pdyot7p8C2CeRL7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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