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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3605efeede60a02c38d18d95f1906bdffcaaac31a336c5a89f18d13b58de1ca9' 
  AND token = '0C1yk3UIwYEaDOCxtACyfXE6YGdj6l6iOl3xBu9z1wE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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