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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d5845e550d3161cea58d9755a3f359d751988bdf781f6118adbe2b1e3b1b35' 
  AND token = 'yYlEpwnVIbwd83NURbJ9ikEGDEymPpBajziL265t+QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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