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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52005ba7342e6fa36be826569149d248059871163ae1d7c9507891464de1b631' 
  AND token = 'WYd50o5ciRt5S3onBP3iiSRj91h6uSgiI9ZcDZhZZIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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