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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a120f02c949ba7fbcc91038adf56e8ede0e7e293c22af00fbfcf0a655174fb' 
  AND token = 'URqQ1pv7K5aK0EKxz4MgXB/P3TzjXpUxlO4U5Bfeh5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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