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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd9bfef4404eda19d3a216e151bf67ab076bf930a690f6be52dfd8a1edc000e8' 
  AND token = 'QZjv1ZJskttAm7C+VzBGnX7TJubZm1tZUJpILUjE1yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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