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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2bbee9992eb2084971fb44370ce105b320bcb1366c1e0a618943b5d5a46cb0e' 
  AND token = '8D8AqjPekHZg3mLnJqIq4qLVyTWCIpcCBXdbCqNmV+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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