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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98bf04bf6193b9c252d344ffe9f1b7bbe5cfb1f7ddf584530abd944474b8a59' 
  AND token = 'nDVmA6OTx7VMfjuuW0tTtaWf9stz4doa4vISMoXUkCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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