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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c06f2f2f03ef46e8124169755654f59ad5cc699fc5394c8897816fd7301e3a7' 
  AND token = 'aY+OZJGHWm0mw28TNtaKBcV7MsT9KNMA1nBoDdxwZRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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