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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '797d3707d4d3356afd2cc3ab95080ceaa189a969d2e3c02dab6655894658141c' 
  AND token = 'Aspepkwaxx94RFpY8XfvU9I8OM9iKQnrKpfRwAxQTt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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