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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f2778d94a2496b201583ea916cbf5867952be79749545c7c113d9fe1ed75437' 
  AND token = '9BK2HLQSe4HaIFAsNs8kwDwLyvlDOPJUnakiBSeMvHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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