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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '479c20073b0560db8d30156b1e6cceabc9fb9457eebd0f5f28fd76cf868341a3' 
  AND token = '4jQb1eefQtE+E1fsBFX2pc/GGUMwfCVKs6DCUBc1zro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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