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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2dea0d279e76696fb7cf264de914f7e46e685e679f142290fec2e2d56685382' 
  AND token = 'v4sfaVAfBkMruJME6G/n/5uL2//CMPQkEGCIgH17L1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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