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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc4b0c6cbfaebbafb9ec893aae4c1ae7167af321c095ca816e97912ac20ee223' 
  AND token = 'bucmqofL6ohB+4AD3KxJK+tgl9tmEI3ZHEqUzD72C1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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