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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba84ec4f72ea632e1b11e879c8b1e21c8a4d9126724715025259dbd54a4dfdc' 
  AND token = 'O/150ig2XoDOSVTaNrYnWePiJFIkP9BE9Rm1MShq530=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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