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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5585346607374858bc40a341a89b266796399c2f21ec278000741cccf3b5d14f' 
  AND token = 'IGEgBenUYiuQTv/fP3A0PYwMluH8ZkoJR017Di8i2SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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