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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a78393a2c6999fd5166f3dd1bbdff7e65027d231ad7b33129ebd9c6b2bf860' 
  AND token = 'OqGcqexWbtvT1gLtcC0lzqGFIMmybTh4cS2JSbu9kvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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