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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2930cfe7afa944e8bbba69735ea999bc6301d1b8b1df537271f4d26538cf3de' 
  AND token = 'N+MNo55IYo7929FyH140mRlFYA0UcM4JINrmTMe6p0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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