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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba1a53ef28b243c0efba50f4d7c0ccfd930b28e87887ab383862827919233fdf' 
  AND token = 'LKykfx+CpXjESzGAdHzgCcCCg82uf7062ANM1SLAq+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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