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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b731886ed98c89a5b40108252782eff34d2e6eec174deeb75977d9419e4bcc' 
  AND token = 'z1a46PORIPyYvcW26Sse8Dv94UhIQ3NB5OOID9J8iaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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