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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '301c5be06f8a125dd8d678d4c49733efb302162895b8161237c6003b5e4c5021' 
  AND token = 'SK4enpWtxf8h53EFhCAwJyktRncwIO0Xax95OU0LFCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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