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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d23ef002059d8614933e8b1d95239849bb7aa482ec03d4e21cd9adc2a4f9dd1' 
  AND token = 'WcDHmTFW2840V0Rej3YlGJm96SVSgFTv6ODHd6Yu+0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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