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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '281c0c771827b5bb8fe6c2befe55070eb02ff9528770001a6fb5a9989eee3a6b' 
  AND token = 'keY3SRwgBfVt5SjM8YDKhsnaY5DCj6o8hlGl8ZzOkBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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