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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed056a279d40ab78c8247c954831e06c4752735cca9bcf310cd8b580b5464da4' 
  AND token = 'QFi2mBvNSa6D/B9WJT0ZWHnqF6KpON259Tk+QB9NqSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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