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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b61994b6dd52cd447c10ae856f0f70efec8db3fe03ac31e522a9ae4ff4b25e6' 
  AND token = 'tirgNXvDWDSi6lDtI5fvgXarBPyrwOUD9F60b8VgCq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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