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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc952bc31cd0bdfa1a99d19b4f3612664bfe3c282079748426f7a73cd5ced42' 
  AND token = 'mKJRWMGZzbI27ySyPFNuYnCjN07XSpV5eibPEkl400w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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