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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bc96747341805d60b303a26849f15ca07b24c33bb51a72e63b9c82889fd1c18' 
  AND token = 'G915sx8zghyG3FsOE2TiNCPTioEaoYwOEqWu+U15Kic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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