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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d14ee079e4de8efea313eda466c414f0ec2b44a8a777113e64da938ac916d6f' 
  AND token = 'vZzYmsIw+euZH6vYu6e8+rowWiugDjREh3I5D5DNwjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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