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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff11144b80533a24f4ac2c094650363062dd45bf708d1dceba4394c8849420c6' 
  AND token = '98Iu+F/knuHNmr2FC6jOUoqHvALshRK7RnaDG0If9L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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