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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f8cd9a7a12c736ead23b3b14f8fdad31d7a437fa95d69e602918744a51476ab' 
  AND token = 'Z6eeKVw5xgrzO+gnreCDLii05m52i0kf/I+Fj6WCkMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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