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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61839a72005fb45162d5e6c65cd085e10b3bdf34438a23ec62deacdc7a9a2db2' 
  AND token = '7F0v0WaiUa5yzHZ5ybu0KcDayha3s8jAWQTXTezdhoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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